Notes and Restrictions on Display and Editing


Please note the following restrictions and precautions when using this product.

CONTENTS

Matters Related to Handling PDF Files

  1. The guideline for PDF files that can be displayed with this product is up to 400,000 pages and a file size of up to 4GB, in compliance with the technical specifications of PDF (ISO32000-2).
    The guideline for PDF files that can be displayed with this product is up to 400,000 pages and a file size of up to 4GB, in compliance with the technical specifications of PDF (ISO32000-2).
    PDF files that do not comply with the technical specifications of PDF may not be handled. Also, even if it is a PDF file within the range of PDF technical specifications, problems may occur in display and operation due to restrictions described in this document, unsupported usage environments, document dependency, etc.

Matters Related to Installation

  1. When trying to update install from removable media (DVD, USB memory, etc.), a message “Please insert Disk 1” may be displayed and installation may not be possible.
    <Measures>
    Please uninstall the installed product and install the new version.
  2. If you uninstall this product and reinstall it, the operation may become unstable, such as not being able to open PDF files. Please refer to the following for measures.
    < Possible Cause >
    The file may not have been completely deleted during uninstallation.
    < Measures >
    With this product terminated, open the [Processes] tab of the task manager. If “SPViewer.exe” remains, forcibly terminate all “SPViewer.exe” with [End Process]. If files remain in the installation folder after uninstallation, please delete them all manually.
    Then, execute the installation again.
  3. If the update installation fails due to the print setting screen of SkyPDF Pro Driver being open, if you close the print setting screen with the [OK] button, the print setting information will not be taken over. Please manually reconfigure the print settings after the update installation is complete.

Matters Related to Association with PDF Files

  1. Even if you set this product to be used as the default app to open PDF, the association setting may not be performed normally depending on the OS.
    < Measures >
    If you want to change the default app, please change it by any of the following methods.
    1. Method to change from the [Preferences] of this product
      1. Launch this product.
      2. Open the [Association] tab in Preferences and click [Change Default Application].
      3. Click the [Change] button on the PDF property screen.
      4. It is completed if you select this product as the default app.
    2. Method to change from the right-click menu of the PDF file
      1. Right-click the PDF file.
      2. Click [Open with] > [Choose another app].
      3. It is completed if you select this product as the default app.
    3. Method to change from the settings of the OS (Example of Windows 10)
      1. Click the Windows logo at the bottom left of the screen and open the start menu.
      2. Click in the order of [Settings] > [Apps] > [Default Apps] > [Choose default apps by file type].
      3. Click the [+] button or app name on the right side of “.pdf”.
      4. It is completed if you select this product as the default app.
  2. If you associate from the installation or [Preferences] of this product, “Microsoft Edge” may not be displayed in the application list of the screen to select the default program.
    If you cancel the association of this product, it will be displayed again.
  3. If you add a user to the OS later, it may take time to associate with that user.
  4. After generating PDF with SkyPDF Pro Driver, in the following cases, PDF may be opened with an application that is not associated.
    1. After associating with this product, if you returned the association with the repair function of Adobe Acrobat Reader / Adobe Acrobat
    2. After associating with this product, if you changed the association to another application with the function of Windows

Matters Related to Launching the Viewer

  1. If you perform an illegal operation such as launching continuously before this product is fully launched, the operation may become unstable, such as not being able to open PDF files.
    < Measures >
    With this product terminated, display the [Processes] tab of the task manager.
    If “SPViewer.exe” remains, forcibly terminate all “SPViewer.exe” with [End Process].

Matters Related to Display Function

  1. The display of PDF files, especially those created on Mac OS without embedded fonts, may differ from the display in other PDF file viewing apps.
    If the font used in the PDF file does not exist on the PC, a font close to the specified font is automatically selected and displayed as an alternative font. Therefore, it may use a different font from other PDF viewing apps, and the position of characters (such as parentheses) may be shifted. Also, surrogate pair characters may not be displayed correctly if the font is not embedded.
  2. The “ZapfDingbats” font is not supported in the Windows environment, so an alternative font is applied, and squares or glyphs of different shapes are displayed.
    < ZapfDingbats predefined reference glyph >
    < Glyph displayed in this product >
  3. Even if the font is embedded, there are characters in the DHP line type font that are displayed on the right when made into a PDF file.
  4. In the case of the seal of the stamp annotation, depending on the number of divisions and the type of characters, it may be displayed slightly off-center.
  5. The style may be broken when editing the free text annotation added with Adobe Acrobat Reader / Adobe Acrobat.
  6. In SDI mode (display in a separate window), you can open the same file multiple times.
  7. When a PDF file located on a network or another PC or server is opened simultaneously in this product and in a different environment from the local PC, the following phenomenon occurs:
    If you edit on the local PC and save overwriting, a dialog stating that the file cannot be overwritten because it is in use is displayed, and when you close it, a “Save As” dialog is displayed. If you also close it by canceling, the edited content remains as it is, overwrite saving is grayed out, and you cannot operate it. Even after closing the PDF that was open in another environment, the overwrite save on the local PC side does not function as it is. Please reopen the file and edit it, or save it under a different name when the “Save As” dialog is displayed above.
  8. This product does not support forms using JavaScript for security reasons. Therefore, buttons and signature fields in these forms do not work.
  9. The [Previous View] / [Next Vew] function remembers up to 5 files before the last display page after closing the PDF file, but this memory cannot be done in the case of a PDF file without a document ID in the internal specifications of the PDF, and such a PDF file is not saved while editing.
  10. Part of the desktop screen may be displayed in the background part of the navigator tab, but it does not affect the operation.
  11. If you display a large number of PDF files with a file name length of about 50 half-width characters and close one file at a time, the tab that was displaying the file name will not be displayed.
    < Measures >
    Please select the file from [Document List] in the [View] menu, or restart the product.
  12. If you add annotations to a rotated PDF or resize the annotation part, only part of the annotation may be displayed. Please shape the annotation so that the length of the vertical and horizontal is the same.

Matters Related to Editing Function

  1. If there is no mapping information to Unicode, you may not be able to select text in some strings in the PDF.
  2. In third-party PDFs (such as GPL Gostscript), if there is no mapping information to Unicode, copying and pasting a string selected as text to another application may cause garbled characters.
  3. If you have the same file open in another PDF viewing/editing app such as Adobe Acrobat Reader, you cannot save the file, so all editing contents such as signatures and annotations made during that time will be discarded. Please make sure that it is not open in another PDF viewing/editing app before editing the PDF.
  4. In the text direct editing function, depending on the PDF file, there may be a phenomenon where the remaining characters are shifted by selecting multiple lines and deleting or adding line breaks, or the selection of text direct editing itself cannot be done.
    Currently, the same phenomenon has been confirmed in some specific PDFs, but we are considering improvements in the future.
  5. For PDFs without a document ID, once you edit and save them, they can be remembered from then on. PDFs generated by SkyPDF Pro Driver are assigned a document ID only for security and PDF/A conversion, but in other cases, they are generated in a state where there is no document ID.
  6. When adding a link to a character, the link may not work with the following operations: 
    1. Add a link to jump to a specific page of a multi-page document to the characters on a specific page.
    2. On a page different from the part where the link was added in a above, add a link to jump to a specified page to the characters in the same way.
    3. When you return to the part where the link was added in a, the popup of the link is displayed as “Page -1”, and the specified page field is blank in the property.
    4. If you save the document as it is, the link in a will work normally. This does not occur with a single-page document or a link added on the same page as a.
  7. If you enter a character that is not linked to the font in the text input area, such as an external character created by linking to the specified font, it will be displayed garbled.
    In the following functions, even if it is garbled on the input screen, if you have set a font linked to the entered external character, it can be inserted correctly.
    • [Page Number Settings] function [Prefix] [Suffix] 
    • [Add Watermark] function [Text]
  8. This product counts 2-byte characters as 1 character. Therefore, 4-byte characters are treated as 2 characters even if they are actually 1 character. Please be careful when using characters that are not 2 bytes (such as surrogate pairs and IVS fonts) in a text input area with a character limit.
  9. In this product, you cannot specify a font that has a font family name including a ‘-’ (hyphen) or ‘,’ (comma) for annotations or form fields. If you see an error message stating “Specified font does not exist,” please use a different font.

Matters Related to Printing

  1. When printing in rendering mode, the data is converted to an image and sent to the printer, so the print spool size becomes large. Therefore, it may take time to print or it may cause a printing error depending on the printer.
    < Measures >
    Please print in normal mode or perform the process to split the print job displayed on the operation screen at the time of printing.
  2. If you print a PDF containing gradients or images expressed for each line in normal mode, a line may enter between gradients (images).
    < Measures >
    Please print in rendering mode.
  3. If an alternative font is used in the PDF and the glyph width of the alternative font is different from the glyph width described in the PDF, if you print with text code output ON, the character spacing will be broken and printed.
    < Measures >
    Please print with text code output OFF.
  4. In the case of Type3 fonts or depending on the model of the printer, if you print with mask image clipping output ON, the print quality may be rough.
    < Measures >
    Please print with mask image clipping output OFF.
  5. In Windows 10 and later, the “Block untrusted fonts” function has been added for security enhancement. Therefore, if you set [Output Text Code] in [Print Setting] tab of prefereces and print, the following will happen:
    1. Text using embedded fonts does not output text codes. Therefore, when using a virtual printer driver for printing and converting files, text using embedded fonts is output in a form that is not recognized as text.
    2. Text using a local font not in the “%windir%\Fonts” folder is output in an alternative font. (Can be avoided by installing in the “%windir%\Fonts” folder) 
    < Measures >
    You can avoid this phenomenon by setting the “Block untrusted fonts” function to [Disabled] or [Monitoring], or excluding the processes of this product (“SPViewer.exe” and “SkyViewPrinting.exe”) from the “Block untrusted fonts” function.
    Details: https://technet.microsoft.com/en-us/library/dn985836(v=vs.85).aspx 

Matters Related to Security Function

  1. In PDFs where only the attached file is encrypted with 128bitAES by the security function, a warning message is displayed when you try to open the attached file, and you cannot open it.

Matters Related to Clipboard

  1. When you select and copy text and paste it into another text editor, the blank line on the PDF is pasted as a blank + line break.
  2. When you select text on the PDF from the text selection button on the toolbar, right-click and select [Copy As Table], and paste it into Excel, the following results will occur.
    1. When pasting into Excel, if you select [Select Format and Paste], if you select the XML Spreadsheet format, it will be copied in a form that reflects the font size, and if you paste normally with Ctrl+V etc., it will be pasted in the XML Spreadsheet format. Also, if you select [Text] or [Unicode Text] when pasting, it will be pasted without reflecting the font size.
    2. Blank cells are ignored, so for example, if you copy a character cell 1 + blank cell + character cell 2 side by side, the result of pasting into Excel is character cell 1 + character cell 2.
    3. The judgment of another cell is performed with two or more blank characters, so if there is no blank of two or more characters at the end of the character in the table as a PDF display area, the result of pasting into Excel will be in the same cell.
    4. The judgment of the next line is performed by the judgment of the position under the previous character string, so the character string whose position is lower than the character string in the table as a PDF display area will be the next line as a result of pasting into Excel.

Matters Related to Page Trimming

  1. Immediately after performing page trimming, various editing operations (examples: bookmarks, annotation addition) may not work properly. After performing page trimming, please save the PDF file once.

Matters Related to Signature

  1. In the GPKI Preference, if you select [Basic] in the [Authentication] field in [Proxy Setting], only Basic authentication can operate.
  2. There is no display indicating the validity or invalidity of the signature on the signature icon added on the PDF display area.
    < Measures >
    Please check the “Signature Verification Status” screen that is displayed when you click the signature icon for the validity or invalidity of the signature.
  3. Signatures added by old products such as PDF editing software that has ended product support may display a “?” mark on the signature appearance even if the signature verification result is valid.
  4. If you add verification information to the signature in a product other than this product, information that has nothing to do with the signature or display may be added. If you verify this with this product, it may be judged that “there was an additional edit after the signature”.

Matters Related to Timestamp

  1. Due to the specifications of Amano Timestamp, it is not possible to add Amano Timestamp to a PDF file encrypted with 256bit AES of Revision 6.
  2. In proxy settings, the timestamp service may cause an error. In that case, please enable [Use HTTP 1.1 through proxy connections] in the advanced settings of Internet options.

Matters Related to Touch Operation Function

  1. It does not support operations with three or more touch points.

Matters Related to Display on Tablet Terminal

  1. Even if you rotate the terminal without locking the automatic rotation function while displaying the PDF file in full screen (Menu: [View] > [Full Screen]) with this product, the orientation of the PDF file does not rotate.

Matters Related to PDF Checker

  1. The syntax check that can be done with the PDF checker of this product is for PDFs that comply with ISO32000-1 or earlier standards. It does not support syntax checking of PDFs that comply with ISO32000-2.

Matters Related to the Display and Editing of Forms

  1. When you edit and save checkboxes or radio buttons created using third-party products with this product, they may be displayed unintentionally depending on the PDF viewer used afterwards. For example, if you check a checkbox created in Adobe Acrobat with this product and save it, when it is displayed again in Adobe Acrobat, the checkmark may be displayed as a number or character, or it may not be displayed at all.
    < Measures >
    If such a problem occurs, try to avoid it in the following ways:
    • If the export value is a default value such as ‘□□0o0D’, setting an appropriate value in the form properties may improve the phenomenon.
    • For checkboxes and radio buttons that are displayed unintentionally, recreate them using the input form function (SkyPDF FormDesigner) of our product.
    • Edit with the same type of application used to create the form.